Cushion spring structure



Patented May 27, 1941 2,243,210 CUSHION SPRING .S'.RUC-'lURE `acob Kerstein, Brooklyn, N. Y., assgnor to Spring Products Corporation, New York, N. Y., a corporation of New York Applicaties Jene 5, 1940, 'seriali No. 338,863

, 3 Claims.

This invention relates to cushion spring structures of the type which are made up of a plu rality of rows of coiled expansion spring units arranged in side by side relation with the opposite end convolutions thereof disposed and secured in common planes parallel to each other, and the invention is directed more particularly to an improved edging therefor which takes the,

place of the usual continuous frame Wires which extend completely around the upper and lower marginal edges of the spring structure.

Among the objects of the invention are the provision of separate edging wire sections for each of the upper and lower marginal edges of the cushion spring structure, by means of which a more accurate control of the measurement of the structure as to its length and width may be attained, due to the relative accuracy with which the length of the individual edging wires may be formed as compared with continuous frame Wires having rounded corner portions, while distortion of the structure is avoided which heretofore has resulted from the tendency of a continuous frame wire to unbend under its inherent resiliency from predetermined radii encompassing the corner springs as wire varies in its analysis thereby resulting in varying degrecs of reaction when bent.

The present invention also economizes in the amount of edging wire employed and effects a substantial saving incident to the cost of joining the overlapped ends of a continuous frame wire, While the securement of the edging wire sections to the spring units does not require any additional attaching clips.

As a further feature the edging wire sections embody opposite terminals which are so constructed, arranged and connected as to eliminate sharp ends which are directed towards the surfaces of the cushion spring structure, while providing means for the establishment of permanent connections with the spring units so as to preclude endwise shifting of the edging Wires and the resulting damage to upholstery or exterior covering material for the spring structure.

The invention further comprehends an intermediate reenforcing Wire formed and secured to the spring units in the same manner as the edging wire and possessing advantages identical therewith.

With the above and other objects in view, the invention is set forth in greater `detail in the following specification and illustrated in the accompanying drawing, in which:

Fig. 1 is a plan view of a cushion spring structure provided with edging Wire sections and an intermediate reenfoncing wire section constructed in accordance with the invention.

Fig. 2 is a fragmentary side View of a spring constructed in accordance with the invention.

Fig. 3 is a fragmentary plan view illustrating a modified form of terminal connection for the edgingand reenforcing wire sections.

Referring to the drawing by characters of reference, A designates the coil expansion spring units of a cushion spring structure, B the spacing wires which extend longitudinally between the rows of spring units and are connected by clips C to. the end convolutions of adjacent spring. units. f

'I'he present invention is directed to independent edging sections designated generally by the reference character D which are provided respectively for each of the upper and lower marginal edges of the spring structure. Each of the edging sections D is fashioned from a length of Wire I0 extending tangentially of the end convolutions of the intermediate spring units at the sides or ends of the structure and secured thereto by means of clips Il embracing the edging section and the contiguous po-rtions of the end convolutions.

The opposite ends of the wire lil of each edging section D are formed with a rebent terminal I2 disposed at an angle to the main length of the wire, the angle being such as to arrange the terminal at a tangent to the end convolution of the corner spring with a clip I 3' embracingly surrounding said terminal and the contiguous portion of the end convolution of the corner spring. In order to preclude any possibility of displacement of the terminals l2 from the clip, each terminal is formed with an angularly disposed extremity l4. It will, of course, be appreciated that the terminal of the edging section at one marginal edge will be secured at a point on the end convolution of one corner spring unit, approximately diametrically opposite the point of securement of the terminal of the edging section D of an adjacent marginal edge, as clearly illustrated in Fig. 1 of the drawing.

If desired, one or more reenforcing sections E, fashioned similarly to the edging sections from a length of wire I5 may be provided to extend transversely of the spring structure and said reenforcing wire sections will be provided with rebent terminals I6 disposed at an acute angle and disposed and secured tangentially to the end convolution of the outer spring units of a row by means of clips l1. The reenforcing wires E will also be disposed tangentially to the end convolutions of the spring units of said row by clips I8.

If desired, as illustrated in Fig. 3 of the drawing, the edging or reenforcing wire sections F may be formed with substantially circular terminals I9 for abutting relation to the end convolutions of adjacent spring units A with said `terminals secured by clips 20 to the end convolutions of adjacent spring units.

What is claimed is:

l. In a cushion spring structure of the type which includes a plurality of rows of coiled expansion spring units arranged in side by side relation with the opposite endconvolutions'thereof respectively disposed in planes parallel to each other, independent edging sections for each of the upper and lower marginal edgesvof the spring structure, each of said edging sections vbeing fashioned from a length of Wire extending tangentially of the end convolutions of the intermediate spring units and secured thereto, and-a rebent terminal at the kopposite endof each section disposed at an acute angle to the intermediate'or body portion thereof,.said `terminals being secured tangentially to the portions of the end convolutions of adjacent corner spring .units and located adjacent the intermediate spring units.

2. In a cushion spring structure of .the type which includes a plurality of rows .of coiled ex- I pansion spring units arranged in vside byside relation with the opposite endy convolutionsithereof respectively disposed in` planes parallel to each other, independent edging sections for each of. the upper and lower marginal edges of the spring structure, each of said edging sections being fashioned from a length of wire extending tangentially of the end convolutions of the intermediate spring units and secured thereto, and a rebent terminal at the opposite end of each section disposed at an acute angle to the intermediate or body portion thereof, said terminals being secured tangentially to the portions of 'the end convolutions of adjacent corner spring units and located adjacent the intermediate spring units, said terminals each having an angularly disposed extremity.

3. In a cushion spring structure of the type which includes a plurality of rows of coiled expansion spring units arranged in side by side rel-ation with the opposite end convolutions thereoi'respectiveiy disposed in planes parallel to each other, independent edging sections for each of the upper and lower marginal edges of said structure, each section being formed from a length of wire extending tangentially of the end convolutions of the intermediate spring units, clips `securing said edging wire .section to the contiguous end convolutions, a rebent terminal atthe opposite end ofeach edging section disposed at an acute angle to the intermediate or body .portionlthereof with the terminals-arranged tangentially to the .portions-of the end convolutionsof the corner units and which portions are adjacent the intermediate spring units, an angularly disposed extremity at the free end of each terminal anda clip embracingly.surrounding each terminal and the adjacent portion of the end convolution .of each corner unit to secure the same together.

JACOB KERS'IEIN. 

